Jack



May 22, 1923.

F. ILSEMANN JACK Filed Jan. 22. 1921 Witnesses.-

nvenfov:

Patented May 22, 1923.

UNITED S'i' PATET I JACK.

Application filed January 22, 1921. Serial No.439,320,

To all whom it may concern.

Be it known that I, FRIEDRICH ILsnMANN, a citizen of the German Republic, residing at Remscheid, Germany, have invented certain new and useful Improvements in Jacks, of which the following is a specification.

The jacks of known construction work with one or with several screw spindles in connection with work-gears or toothed wheel gears. They have the inconvenience that they work heavily, consist of several separate parts and get easily jammed.

According to this invention the pressure piston movably connected in a casing has threads and is displaced by a screw spindle being inserted.

A further feature of the invention is that the pressure piston is guided upon a bolt, for example of rectangular cross section in such a manner that it can be displaced but is ensured against rotation and that the pressure piston has internal threads into which the screw spindle is screwed which is opposed only by the pointed end of the guide bolt. The head piece with screw threaded part is mounted upon the hydraulically lifted piston.

In the accompanying drawing the invention is shown by way of example.

The only figure of the drawing represents the improved jack in longitudinal section.

The jack consists of the base plate and frame a which comprises an inclined cylinder 0 and a vertical cylinder 6. In the vertical cylinder 72 the piston 6 with packing d is movably mounted. In the piston e the spindle is located which carries at the upper end the head piece f designed to be placed under the axle of the car. The spindle r; can be adjusted by hand by means of a nut h. In the inclined cylinder 0 the piston Ir: with packing i is movably mounted. This piston is is guided by means of a ring Z upon the guide bolt m of rectangular cross section. The inclined cylinder 0 is shut off by the nut n of a stufiing box, said cylinder 0 communicating with the cylinder 6 by a channel 0. The piston 71': has internal threads 77 designed to receive the screw spindle q of a hand rod 1". In the end of the screw spindle g a cavitys is provided adapted to engage with the pointed end t of the guide bolt m. The cylinders b and 0 and the channel 0 are filled with liquid such as oil, glycerine or the like through an inlet which is closed by a screw stopper u.

I The operation of the jack is as -follows:- hen the screw spindle g is being screwed into the piston is this piston is gradually withdrawn but is prevented from turning by the guide bolt m.

The liquid in front of the pressure piston 70 acts upon the piston e and lifts the same, whereby at the-same time the head piece f is lifted.

As the screw spindle is guided merely upon the pointed end 6 of the guide bolt the device works with very little friction and as otherwise only very small losses from friction are producedthe jack can be easily manipulated.

1. An improved hydraulic jack of the type in which an internally threaded pressure piston guided in the casing filled with incompressible liquid is operated by means of a spindle to be screwed into said piston comprising in combination a casing filled with incompressible liquid, a guide rod of unround cross section fixed in said casing, a pointed end of said rod, a hollow pressure piston movably mounted in said casing upon said guide rod and having internal threads in its boring, a screw spindle to be screwed into the boring of said piston having a cavity in its end designed to engage over the pointed end of said guide rod so that said spindle after it has been screwed into said piston pulls said piston forward or pushes the same back upon said rod according to the direction in which it is being turned.

2. An improved jack comprising in combination with the base plate an inclined cylinder and a vertical cylinder connected by a channel and filled with oil or the like, a vertical piston in said vertical cylinder, a head 7 piece upon said vertical piston, a pressure piston with internal threads in said inclined cylinder, a guide pin of rectangular cross section fixed in said inclined cylinder and projecting into said pressure piston, a pointed head of said guide bolt and a screw spindle with handle having acavity in its end and. adapted to be screwed into said pres sure piston so that the cavity engages with said pointed head of the guide bolt.

3. An improved jack comprising in combination with the base plate an inclined cylinder and a vertical cylinder connected by a channel and filled with oil or the like, a vertical piston in said vertical cylinder, a

screw spindle in said vertical piston, a head piece upon said screw spindle, means for adapted to be screwed into said pressure 10 adjusting the position of said screw spinpiston so that the cavity engages with said dle in the Vertical piston, a pressure piston pointed head ofthe guide bolt.

with internal threads in said inclined cylin- In testimony WhereofI afiiX my signature der, a guide pin of rectangular cross section in presence of. two Witnesses.

fixed in said inclined cylinder and projecting FRIEDRICH ILSEMANN. into said pressure piston," a pointed head of Witnesses:

said guide bolt and a screw spindle with ALBERTINE PORGER,

handle having a cavity in its end and HEINZ W HALL; 

